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(No Model.)

B. H. PHIPPS.

GONDUIT FOR ELEGTRIG WIRES OR GABLES. No. 395,584. Patented Jan. 1, 1889.

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UNITED STATES PATENT OFFICE.

EDYARD ll. PillPPS, OF NE\V HAVEN, CONN EUllCU'l, ASSTGYUR TO EDlVARD PEROT ANT) JAMES P. MCQFAIDE.

CONDUIT FOR ELECTRIC WIRES OR CABLES.

SPECIFICATION forming part of Letters Patent No. 895,584, dated January 1, 1889. Application filed July 26, 1887. $e1'ialNo. 245,325. (No model.)

Be it known that-l, EDWARD lI.lu[PPs, rcbridges l),whiehare placed between the pipes, siding at New Haven, in the county of New j are providtal with straight or square ends I, Haven and State of Connecticut, have int and have each edge .l provided with semicir- 5 vented certain new and useful Tmprovemcnts cular depressions K, receiving the pipes.

in Conduits for Electric \Vires or Cables; and lhcse bridges so fit together and around the I do declare the following to be a full, clear, 5 pipes as to form a perfect partition. transverse and exact description of the same, reference j to the line of the conduits, such partitions bebeing had to the accompanying drawings, i ing located at about pipe-lengths along the To which form a part of this specification. line. A filling, L, of cement or sand, or both,

My invention relates to an improvement in or of other material or composition, is filled in underground conduits for electric wires or cabetween and isolates and in'ottects the pipes bles, the object being to produce such a conand forms joints between them, while the parduitwhich shall be cheap, permanent, and dry. titions isolate, as it were, the blocks of filling,

I 5 \Vith these ends in view my invention conwhich are poured in between them in the sists in a conduit for electric wires or cables form of grout. The ends E and edges F of composed of a sheet-metal tube or shell and the bridge 0 and the ends I of the bridge I) a lining of cement therefor. together give a rectangular outline to the par- Myinvention further consists in a multiple titions. Preferablyaml herein shown, the

2o conduit composed of two or more cement-lined pipes, bridges, and filling are inclosed in a rectmeta-llic pipes, bridges or supports supportangular casing, M, which protects the whole ing such pipes in isolation and extending fabric and forms in its bottom port ion a guide transversely across the line of the conduit-fabfor laying in truth the lower bridges, which ric and a filling filled in between the pipes. determine. the line or integrity oi the whole 2 5 My invention further consists in certain defabric.

tails of constructioi'i and combinations of Anyeificicnt joint may be employed for the parts, as will be hereinafter described, and pipes. As herein shown, the pipes of the two pointed out in the claims. lower lines are provided with shouldered con- In the accompanying drawings, Figure l is cave and convex rings N and O. Theserings So 0 a view in longitudinal section of one form are made, by preference, asiron castings, male which a conduit embodyingmyinvention ma and female, and loosely fitted one into the assume. Fig. 2 isa view thereof in transverse other, so as to admit of the inevitable creepsection on the line a b of Fig. 1, and looking ingof such structures. This simple construcin the direction of the arrows. Fig. 3 is a dction makes an excellent expansion-ioint. The S- tached view of one of the outer bridges, and pipes of the upperline are simply abutted and Fig. at is a similar view of one of the inner inclosed at the joint by a sleeve, P, which is bridges. packed with cement.

The conduits or pipes through which the. Conduits made in accordance with my inelectric wires or cables are passed are each vention are cheap to construct and are prac- 9 40 composed of a sheet-metal tube or shell, A, ticall v permanent when oncelaid. Thevprehaving a lining, B, of cement-that is, a maserve the wires or cables free from moisture terial which not only serves as insulation for and reduce electrical disturbancebetween the the electric wires, but which hardens under wires or cables of the respective pipes.

water and takes a permanent and rigid form. If desired, the casingmavbe dispensed with.

5 As herein shown,pipes so constructed are sup- If desired, also, the bridges may be arranged ported near their ends in outer bridges, C, and out of alignment, so as to secure a more even inner bridges, 1), made of cement or other distribution. of strain upon thepipes. lwould composition,or of wood. 'lhebridges C,which therefore have it understood that I do not support and cap the pipes, have straight or limit myself to the exact construction and I00 50 square ends E, one straight edge, F, and one combinations of parts herein described, and edge, G, provided with semicircular deprespointed out in the claims, but hold myself at To all whom, it may concern: i sions ll, adapted to receive the pipes. The i liberty to make such changes and alterations as fairly fall within the spirit and scope of my invention.

I am aware that it is old pipes lined with insulating compositions o'tvarious kinds, and I make no claim broad enough to include such construction. My invention consists, essentially, in this regard of a sheet-metal tube or pipe lined with hydraul ie or like cement, which is not only an electric insulator, but which also hardens under water, takes a permanent form, and is practically indestructible in use. \Vith a lining of this sort it is practicable to avoid the use of cast-iron pipes, which are heavy, umvieldy, and expensive. The sheet-metal tube is sufficiently rigid and durable to give form to the conduit, and the permanent and rigid lining of com cut gives additional stability and durability. Such conduits can be aggregated into a multiple system with great case, in small space, and with good permanent results.

to use cast-iron ED\YARD II. PHIPPS.

Witnesses:

(Has 13. SHUMWAY, EDWARD H. Recon. 

